The Microsoft .NET Framework 4.5.1 RC for Windows Vista SP2, Windows 7 SP1, Windows Server 2008 SP2, Windows Server 2008 R2 SP1

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Microsoft .NET Framework 4.5.1 RC for Windows Vista SP2, Windows 7 SP1, Windows Server 2008 SP2 and Windows Server 2008 R2 SP1

The following file is available for download from the Microsoft Download Center:
Download the package now.

Microsoft .NET Framework 4.5.1 RC Language Pack for Windows 7 SP1, Windows Vista SP2, Windows Server 2008 R2 SP1, and Windows Server 2008 SP2

The following file is available for download from the Microsoft Download Center:
Download the package now.

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to obtain Microsoft support files from online services

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What’s new in the .NET Framework 4.5.1 RC?

The .NET Framework 4.5.1 RC supports the writing of code in C#, Visual Basic, and F# programming languages, and includes these significant language and framework enhancements:

• Better performance and reliability
• ASP.NET application suspend and resume
• On-demand compaction of the large object heap
• 64-bit Edit and Continue
• Activity tracing and sampling
• SQL connection resiliency
• Managed return values

For more information about these and other features of the .NET Framework 4.5.1, see the .NET Framework Developer Center website and blog post. This version of the .NET Framework runs side-by-side with the Microsoft .NET Framework 3.5 Service Pack 1 (SP1) and earlier versions, but performs an in-place update for the .NET Framework 4 and the .NET Framework 4.5.

Command-line switches for this update

For more information about the various command-line switches that are supported by this update, go to the "Command-Line options" section of the following MSDN website:

Restart requirement

You may have to restart the computer after you install this software if any affected files are being used. We recommend that you close all applications that are using the .NET Framework before you apply this update.